Vacuum Tube Amplifier
January 14, 2026 • EPISODE 293
📌 Science Fair Idea – R-51 Radio
What’s a vacuum tube amplifier? Come explore with Dr. Roger Billings on Science LIVE! Learn about the technology that made it possible to boost electrical signals and amplify sound. Discover how vacuum tubes control electron flow, why they powered early radios, audio systems, and computers, and how they shaped modern electronics. And get ready for something super exciting: carbon nanotubes – super-strong, lightweight materials that might one day help build a space elevator, opening new ways to reach space!
About DrB
Dr. Roger Billings is a visionary innovator whose work has touched the lives of millions of students and transformed the landscape of education. Widely known as “DrB” to the countless kids who benefit from his groundbreaking Acellus learning system, Dr. Billings has dedicated his life to advancing education through technology.
As part of DrB’s lifelong commitment to supporting education, Science LIVE was launched as a way to “give back” by mentoring students in conjunction with the Roger Billings Scholarship Program.
Read more about DrB »
About the Roger Billings Scholarship Program »
Crazy how stuff works great video!!
I love science live!!!!!
Hello, I’m from mesa, az and I learned a lot about vacuum amplifiers and how it makes sound louder!
Great episode! Thank you for sharing!
Loved this video! Can’t wait till next week!
i loved this one
Science is my favorite subject
I enjoyed watching this weeks episode! Sorry I was late to the party.. I have been sick for the past 2 weeks.
Never knew this!! Amazing!
Carbon Nanotubes are so cool, using them to make smaller, more compact computers, better body armor, and longer lasting batteries, very awesome.
these episodes never fail to amaze me!
Very interesting! Loved this episode!
Very cool!
Hello from Texas!
I like how they broke it all down
It is good to know that science is the search for truth. I have never thought of it that way.
I love this!
I 🩷 Science!
It’s interesting how impactful the science fair can be.
Wow that was really interesting, it helped me so m much, thanks for the information!
Honesty is always the best policy.
Hello from ND
loved this Ep!
Always so interesting every episode
Honesty is important
Thank you
Love this episode!
Science Live is really interesting
Very cool she is a weightlifter!
So cool! being honest is so important.
I watched with my sister
Space Elevator? Low-key Crazy!!!!
That was interesting about the carbon nano tubes. I never heard of them before
THIS WAS FUN
I like Morse code!
Very cool
carbon nano tubs are so cool.
What are the primary functions of the cathode, anode, and grid in a vacuum tube amplifier circuit??
Does fish breeding count as science?
Awesome Live
hi i am new and i love it
This is a great episode!
carbon nano tubes are exciting tech.
Acellus is the best learning curriculum fr
My dad was in the army, the carbon nanotubes would have made his armor a lot lighter. There will be many uses for these tubes in the future.
Honesty is big in our house!
My mommy teaches me to be honest
I LOVE SCIENCE LIVEEE!!!!!!
I didn’t know carbon nanotubes are that strong.
It’s so interesting to see something take advantage of in daily life be such an incredible new invention.
my mom always taught me being honest gets you into less trouble than lying
Love learning more new things!
I love science live
I learn new things every week, like how a Amplifer tube works!
Carbon nano tubes are so cool!!
This was very unique.
i like how this science works
This episode was very cool
If the Armor is lighter hopefully it will still be strong
This science live was pretty interesting!
Nano tubes are really interesting, they are really tiny, but they can be very useful
This was so interesting!
So cool!!
It’s hard to hold up many lies. There expensive and wastefull. U_U
Very fun episode to watch!
this episode was cool
honesty is the best policy! thank you so much for this live.
hello from Texas! this is so cool aswell.
this was a good episode, thank u
i loved this weeks lesson
Honesty is always the best policy. Great episode
This episode was amazing!
Crazy how this stuff works, thanks Dr. Billing.
This episode was very cool
Thanks Dr. Billings! This was a great episode.
Great Live!!!
How did they make the vacuum machine so small?
Honesty is so important!
This might be my favorite episode . (Also rewatching)
How the Usb Flash Drive was created is so interesting!
We love r. 51 he is so funny !
Thank you Dr. Billings. I feel defeated at times with some of my work. Thank you for sharing for us to keep going.
very informative
Hello from Minnesota
Does any one still use usb in 2026?
I love this, keep going!
I find it fascinating about how carbon nano tubes can be used as a substitution for silicon in semi-conductors.
How many Strands do you need to send them up to space?
Science live is the best love what y’all do
Great stuff!
I love science live
This is so cool! Never knew how tube amps worked!
I love watching you guys
What would the world look like now if AI never existed?
wow what a episode
That was a good video, and I’m glad that David and Caleb were both kept as proteges.
I agree with honesty. It reminds me of the saying, “Honesty is the best policy”.
i think science live is the best
Honesty is the best policy
Science Live!!!
This is amazing
What day is the science fair going to be on?
Vacuum tubes make sounds louder and help radios work!
i feel like being honest is a reay good thing to be a good individual, it helps creates bonds and relationships.
Honesty is key
R51 is very funny!!!
I love science live
I love science live its so exciting .I can’t wait for the science fair.
R51 is hilarious
Honesty is most definitely the best 😊
Honesty is super important!
This is awesome!!
love r 51
Science live was so cool ❤️🔥 today